From 2aa56cca3571fd08c0c38f3e2d4bb0bfb3def3c5 Mon Sep 17 00:00:00 2001
From: Nick Kossifidis <mickflemm@gmail.com>
Date: Wed, 29 Apr 2015 23:51:21 +0000
Subject: [PATCH] ath9k: Mix the received FFT bins to the random pool
E/M noise is a pretty good source of entropy so we mix the FFT
measurements of the E/M spectrum to /dev/random pool. Note that
this doesn't increase the pool's entropy count but it still helps
on improving the output of /dev/(u)random.
Signed-off-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
---
drivers/net/wireless/ath/ath9k/common-spectral.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/ath/ath9k/common-spectral.c b/drivers/net/wireless/ath/ath9k/common-spectral.c
index 5840b3731d5ba..a8762711ad74b 100644
--- a/drivers/net/wireless/ath/ath9k/common-spectral.c
+++ b/drivers/net/wireless/ath/ath9k/common-spectral.c
@@ -15,6 +15,7 @@
*/
#include <linux/relay.h>
+#include <linux/random.h>
#include "ath9k.h"
static s8 fix_rssi_inv_only(u8 rssi_val)
@@ -647,13 +648,24 @@ int ath_cmn_process_fft(struct ath_spec_scan_priv *spec_priv, struct ieee80211_h
tsf, freq, chan_type);
memset(sample_buf, 0, SPECTRAL_SAMPLE_MAX_LEN);
+
+ /* Mix the received bins to the /dev/random
+ * pool
+ */
+ add_device_randomness(sample_buf, num_bins);
}
/* Process a normal frame */
- if (sample_bytes == sample_len)
+ if (sample_bytes == sample_len) {
ret = fft_handler(rs, spec_priv, sample_start,
tsf, freq, chan_type);
+ /* Mix the received bins to the /dev/random
+ * pool
+ */
+ add_device_randomness(sample_start, num_bins);
+ }
+
/* Short report processed, break out of the
* loop.
*/
--
2.30.2